LEDwholesalers Nichia 365 NM 5 LED UV LED Ultra Violet Blacklight Longwave Flashlight, 7354 Produces true Longwave Ultraviolet (NOT visible) light (wavelength 365-370 nm from 5 Nichia LEDs w/100,000 hr-life) Peak Wavelength on 365 nm, Not purple light like 400 nm UV light used to prevent forgery, authenticate documents, Minerial Detector, Essential tool for law enforcement, postal inspections, customs, medical forensics Eye Protection is recommend